In the most general terms, I would want a work truck (or van) to have the following:
-Be small and maneuverable enough to park in a normal space;
-Have remot-controlled mirrors;
-Have some means to transport long stuff (like pipe and ladders);
-Have some bulk transport capacity (like thet big wire cut you need to get);
-Have a 3/4 ton load rating;
-Have an engine large enough to easily merge on the freeway, even when fully loaded;
-Have real 10-ply truck tires (cheap tires or passenger tires won't stand up); and,
-be set up for towing (up to 1 ton tow).